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# SPDX-License-Identifier: Apache-2.0
# Copyright 2019 The meson development team
from __future__ import annotations
"""Provides a mixin for shared code between C and C++ Emscripten compilers."""
import os.path
import typing as T
from ... import options
from ... import mesonlib
from ...options import OptionKey
from ...mesonlib import LibType
from mesonbuild.compilers.compilers import CompileCheckMode
if T.TYPE_CHECKING:
from ...environment import Environment
from ...compilers.compilers import Compiler
from ...dependencies import Dependency
else:
# This is a bit clever, for mypy we pretend that these mixins descend from
# Compiler, so we get all of the methods and attributes defined for us, but
# for runtime we make them descend from object (which all classes normally
# do). This gives up DRYer type checking, with no runtime impact
Compiler = object
def wrap_js_includes(args: T.List[str]) -> T.List[str]:
final_args: T.List[str] = []
for i in args:
if i.endswith('.js') and not i.startswith('-'):
final_args += ['--js-library', i]
else:
final_args += [i]
return final_args
class EmscriptenMixin(Compiler):
def _get_compile_output(self, dirname: str, mode: CompileCheckMode) -> str:
assert mode != CompileCheckMode.PREPROCESS, 'In pre-processor mode, the output is sent to stdout and discarded'
# Unlike sane toolchains, emcc infers the kind of output from its name.
# This is the only reason why this method is overridden; compiler tests
# do not work well with the default exe/obj suffices.
if mode == CompileCheckMode.LINK:
suffix = 'js'
else:
suffix = 'o'
return os.path.join(dirname, 'output.' + suffix)
def thread_link_flags(self, env: 'Environment') -> T.List[str]:
args = ['-pthread']
count = env.coredata.optstore.get_value(OptionKey(f'{self.language}_thread_count', machine=self.for_machine))
assert isinstance(count, int)
if count:
args.append(f'-sPTHREAD_POOL_SIZE={count}')
return args
def get_options(self) -> options.MutableKeyedOptionDictType:
opts = super().get_options()
key = OptionKey(f'{self.language}_thread_count', machine=self.for_machine)
opts[key] = options.UserIntegerOption(
self.make_option_name(key),
'Number of threads to use in web assembly, set to 0 to disable',
4, # Default was picked at random
min_value=0)
return opts
@classmethod
def native_args_to_unix(cls, args: T.List[str]) -> T.List[str]:
return wrap_js_includes(super().native_args_to_unix(args))
def get_dependency_link_args(self, dep: 'Dependency') -> T.List[str]:
return wrap_js_includes(super().get_dependency_link_args(dep))
def find_library(self, libname: str, env: 'Environment', extra_dirs: T.List[str],
libtype: LibType = LibType.PREFER_SHARED, lib_prefix_warning: bool = True) -> T.Optional[T.List[str]]:
if not libname.endswith('.js'):
return super().find_library(libname, env, extra_dirs, libtype, lib_prefix_warning)
if os.path.isabs(libname):
if os.path.exists(libname):
return [libname]
if len(extra_dirs) == 0:
raise mesonlib.EnvironmentException('Looking up Emscripten JS libraries requires either an absolute path or specifying extra_dirs.')
for d in extra_dirs:
abs_path = os.path.join(d, libname)
if os.path.exists(abs_path):
return [abs_path]
return None
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